RFR (S) CR 8014448: Purge PrintCompactFieldsSavings

[Aleksey Shipilev]

Hi,

Please review:
  http://cr.openjdk.java.net/~shade/8014448/webrev.00/

This somewhat cleans up the field layout code by purging the debug
output we don't need.

Testing:
  - full JPRT cycle against hotspot-rt

-Aleksey.